sd = new Array(); // search data: array of image objects

// image object constructor
function io(search_string, title, url, thumb_url, width, height,
	    album_title, album_url) {
  this.search_string = search_string;
  this.title = title;
  this.url = url;
  this.thumb_url = thumb_url;
  this.width = width;
  this.height = height;
  this.album_title = album_title;
  this.album_url = album_url;
}